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2008 CONCRETE TECHNOLOGY FORUM | FOCUS on SUSTAINABLE DEVLEOPMENT Tentative Program – Sorted by Presenter 2008 CONCRETE TECHNOLOGY FORUM | FOCUS ON SUSTAINABLE DEVLEOPMENT Tentative Program – Sorted by Presenter Presenter: Akkapeddi, Srikanth Title: Impact of Using Alternative Fuels to Produce Portland Cement on Cement and Concrete Properties Author(s): Srikanth Akkapeddi, Dustin Swart, Anton Schindler, and Steve Duke and Don Stafford Abstract: Portland cement manufacturing involves combustion of fuels with different raw materials at approximately 1,500 °C to produce clinker. Fuel costs and environmental concerns have encouraged the cement industry to explore alternatives to the conventional fossil fuels. The key objective is to maintain the cement production and quality while extracting energy from industrial waste fuel, or bio fuels, while keeping the impact on the environment and costs to a minimum. In this study, portland cement was produced at a full-scale cement plant during 3-day trial burns of various alternative fuels along with coal. The fuels investigated are: coal only; coal and tires; coal, tires and waste plastics; and coal, tires and broiler litter. Chemical analyses showed that the primary chemical compounds in cement (Al2O3, CaO, Fe2O3 and SiO2) exhibited no significant changes during the trial burn periods that included alternative fuels. Cement and concrete properties for each fuel burn were determined. It is concluded that tires, waste plastics and broiler litter are potential alternative fuels for cement production. Schedule: Technical Session T14.3 - May 21, 3:30-5:00 Presentation Length: 30 minutes Presenter: Ashley, Erin Title: Comparison of Green Building Rating Systems Author(s): Erin Ashley Abstract: The green building movement continues to gain momentum as developers, government agencies, and designers build structures to minimize environmental impact. To take full advantage of this movement and be a participant in the process, the ready mixed concrete industry must have a detailed understanding of the design concepts and guidelines detailed in the current green building rating systems. This presentation will attempt to provide a comparison and overview of several popular green building rating systems such as: Leadership in Environmental Energy and Design (LEED), Green Globes, National Association of Homebuilders National Green Building Standard, and Environmental Protection Agency Energy Star Program. Schedule: Technical Session T01.3 - May 20, 10:30-12:00 Presentation Length: 30 minutes Presenter: Ashley, Erin Title: Environmental Life Cycle Assessment Author(s): Erin Ashley Abstract: Environmental life cycle assessment (LCA) is the investigation and valuation of the environmental impacts of a given product, process or service. The term 'life cycle' refers to the “cradle to cradle” assessment including all phases of a products existence including raw material extraction, manufacture, assembly, distribution, use and disposal/recycle/re-use including all intervening transportation steps. This presentation will provide a brief overview of the concept of LCA and its potential future use in evaluating construction products and projects. Schedule: Technical Session T03.1 - May 20, 1:30-3:00 Presentation Length: 30 minutes Presenter: Basham, Kim Title: Wal-Mart’s Experiences with Adding Fly Ash to Concrete Mixes for Floor Construction Author(s): Kim Basham Abstract: Wal-Mart Stores Inc. has changed their construction specifications to require all steel-troweled concrete floors placed at Wal-Mart Stores, Supercenters, Neighborhood Markets, Sam’s Clubs and Distribution Centers to contain 15-20% fly ash by cement substitution. This change is part of a larger sustainability effort by Wal-Mart to reduce their greenhouse gas footprint and based on results of a concrete research program that investigated the feasibility of substituting fly ash for portland cement in integral-colored, steel-trowel floors. This presentation will cover the findings of this research program including: mix designs, concrete set times, window of finishability, finishing techniques, curing and polishing. Results from evaluating the hardened test floors including gloss, resistance to staining and abrasion will also be discussed. The challenges and risks versus benefits of adding fly ash to steel troweled floors will be presented. Schedule: Technical Session T16.1 - May 22, 8:00-10:00 Presentation Length: 30 minutes 1 2008 CONCRETE TECHNOLOGY FORUM | FOCUS ON SUSTAINABLE DEVLEOPMENT Tentative Program – Sorted by Presenter Presenter: Biddle, Dan Title: Next-Generation Macro-Synthetic Fibers: Advances in Durability, Ductility, and Joint-Spacing Author(s): Dan Biddle Abstract: Synthetic fiber reinforcement for concrete was brought to the U.S. construction market in 1978. These first-generation fibers were made of polypropylene and other like-synthetics, and were primarily used to reduce shrinkage cracking during the early life of concrete. Since that time, synthetic fibers have become a staple in a wide variety of precast, shotcrete, and flatwork projects and applications. In 1999, the next generation of macro-synthetic fibers were introduced that used better shapes, lengths, chemistries, and dosages to greatly expand the performance and capabilities of these fibers. Reducing and/or replacing conventional steel reinforcement, extension of normal joint-spacing, and ductile mode of failure properties have pushed these fibers to the forefront on scores of innovative and forward-thinking projects worldwide. Schedule: Technical Session T15.3 - May 22, 8:00-10:00 Presentation Length: 30 minutes Presenter: Bucher, Brooks Title: Preliminary Comments on Shrinkage and Shrinkage Cracking Behavior from Cement Systems that Contain Limestone Author(s): Brooks Bucher, Aleksandra Radlinska and Jason Weiss Abstract: The use of limestone fillers is one way to improve the sustainability of construction. While, the environmental benefits of limestone addition are well known, the influence of these materials on shrinkage and the potential for cracking has been questioned. In this paper, the authors evaluate three cements including a reference cement and two cements containing limestone (5% and 10% by replacement) from the time of casting until 28 days. Total deformation is assessed from the time of casting using a combination of the corrugated tube protocol and the ASTM C157 technique. Further, the restrained ring test (ASTM C 1581) is used to quantify the development of residual stresses and the potential for cracking in these systems. The results indicate that the limestone cements exhibit similar or less shrinkage than the plain case when the shrinkage is measured properly. Schedule: Technical Session T10.3 - May 21, 10:30-12:00 Presentation Length: 30 minutes Presenter: Buffenbarger, Julie Title: Pervious Concrete Pavement Hydrological Design Considerations and Methods Author(s): Julie Buffenbarger Abstract: Urbanization significantly alters the hydrology of a watershed as residential and commercial development leads to an increase in impervious surfaces. By utilizing site design techniques that incorporate on-site storage and infiltration and reductions in the amount of directly connected impervious surfaces, the amount of runoff generated from a site can be significantly reduced. Pervious concrete pavement, an EPA best management practice (BMP) for the management of stormwater and prevention of pollution from stormwater runoff, allows storm water to filter through, and into the underlying soils or recharge beds that act as retention areas. The open cell structure filters pollutants from untreated runoff discharging into storm sewers, rivers, and streams. The design robustness of pervious concrete systems is dependent upon properly engineered hydrological design parameters, including the amount of rainfall expected, pavement characteristics and underlying soil properties. Proper design of these parameters will be discussed. Schedule: Technical Session T07.2 - May 21, 8:00-10:00 Presentation Length: 30 minutes Presenter: Bühler, Eckart Title: High Percentage Recovered Mineral Component [Silica Fume] in Cement and Concrete for Extreme Concrete Exposure and Exceptional Concrete Durability Applications Author(s): Eckart Bühler Abstract: EPA has designated silica fume, a very fine dust-like material generated during alloyed metal production, as a recovered mineral component (RMC) that functions as a concrete additive to increase strength and durability. Silica fume has been widely utilized in the U.S. for the past quarter century in the ready mixed concrete industry. It is now universally known for its contributions to high performance concrete (HPC), primarily for applications of high strength-, high modulus of elasticity-concrete as well as providing low permeability concrete characteristics offsetting the accelerating properties of chloride-induced corrosion. This presentation will focus on the lesser known benefits of silica fume utilized at high addition rates from 15-25% (by the weight of cement) for applications in the heavy industrial sector. Abrasion, impact and chemical resistance are some of the durability issues addressed. Schedule: Technical Session T08.4 - May 21, 8:00-10:00 Presentation Length: 30 minutes 2 2008 CONCRETE TECHNOLOGY FORUM | FOCUS ON SUSTAINABLE DEVLEOPMENT Tentative Program – Sorted by Presenter Presenter: Bury, Mark Title: The Role of Admixture Technology on the Sustainable Development of Concrete Projects Author(s): Mark Bury Abstract: It is well established that concrete is a versatile building material and plays an important
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